[S] Change in coreboot[main]: commonlib/device_tree: fix 64-bit misaligned member access

[Joel Bueno (Code Review)]

Attention is currently required from: Carlos López, Maximilian Brune, Philipp Hug, ron minnich.

Joel Bueno has posted comments on this change by Joel Bueno. ( https://review.coreboot.org/c/coreboot/+/85800?usp=email )

Change subject: commonlib/device_tree: fix 64-bit misaligned member access
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Patch Set 4:

(3 comments)

Patchset:

PS4: 
Added a secondary change to actually add the FDT parsing for Spike target: https://review.coreboot.org/c/coreboot/+/86588/1

This one is to fix one of the issues we found for RV when doing so.

Commit Message:

https://review.coreboot.org/c/coreboot/+/85800/comment/7ceb6170_86ac0e01?usp... :
PS3, Line 16: his does not happen on qemu because, for that target, we parse the
            : FDT instead of manually probing memory.
> Its your choice, but you might as well re-use this patch.

Acknowledged

https://review.coreboot.org/c/coreboot/+/85800/comment/269f5e9a_3e0aa45e?usp... :
PS3, Line 19: TEST=boot verified on SPIKE-RISCV
> Could you also add the cmdline of spike that you tested with? (makes it easier to reproduce).

Done